List of Links Offering Free Programming Books (Official / Legal)

On the internet there are many free books, not only pirated but also official ones. But if there is an official, why should choose the pirated ones? yet the quality is not much different. So, here is a list of some sites that provide free programming books (official / legal)

2. O'Reilly Media
O'REILLY's compilation of the best insights from subject matter experts and industry insiders in one place, so we can dive deep into the latest of what’s happening in the world of software engineering, architecture, and open source. You can freely download the books in ePub / Mobi / PDF format (or Save to Google Drive) by filling out a form with your full name and email address.The List: Software Engineering (Java, Python, Other), Open Source, Software Architecture (36 ebooks)